Planning method based on source-network-load-storage integrated cooperation

Abstract

The invention provides a planning method based on source-grid-load-storage integrated coordination, and relates to the technical field of power grid planning, a source-grid-load-storage integrated coordination planning method is constructed from four aspects of a source side, a grid side, a load side and a storage side in combination with regional power grid development planning, and how to access large-scale new energy and the influence on power balance are considered at the source side; the power supply demand of a user is considered on the network side, and large-scale new energy consumption and transmission are adapted; interaction responses of flexible resources such as electric vehicles and load demand responses are considered on the load side; reasonable configuration of energy storage facilities is considered on the storage side; and finally, evaluating the reasonability of the power grid planning through safety margin verification. The technical problem to be solved by the invention is to provide a planning method based on source, network, load and storage integrated collaboration, four aspects of source, network, load and storage can be covered, and close combination of a power grid, a power supply, energy storage and load is realized by utilizing a planning process of'two superposition + two balance + two verification '.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid planning, and in particular to a method capable of integrated collaborative planning based on "source, grid, load and storage". Background Art

[0002] As new power systems serve the access and consumption of new energy, the power grid, as an energy transmission channel, is connected to new energy on one end and to loads on the other. At the same time, due to the "double high" characteristics of new energy, large-scale energy storage is required to ensure the economical and efficient operation of the power grid. At present, the traditional power grid planning method only plans power sources, loads and energy storage separately, and cannot organically combine them, lacking an integrated planning method. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a planning method based on the integrated coordination of source, grid, load and storage, which can cover the four aspects of source, grid, load and storage, and use the planning process of "two superpositions + two balances + two verifications" to achieve a close integration of the power grid with power sources, energy storage and loads.

[0004] The planning method based on source-grid-load-storage integrated collaboration comprises the following steps: S1: Forecast the conventional load based on the historical annual load of the region.

[0005] For conventional load forecasting, the natural growth + large user method, maximum load utilization hours method, and time series method can be used for forecasting.

[0006] S2: Forecast new loads based on the development of new loads in the region.

[0007] New load forecasts include electric vehicle charging, 5G base stations, and “coal to electricity” new load forecasts.

[0008] S3: Forecast the total load based on the conventional load and new load conditions in the region.

[0009] When forecasting the total load, the calculation is performed according to the following formula: Total load = new load + conventional load.

[0010] S4: Forecast power plant output based on regional power supply conditions.

[0011] Power plant output forecast includes power source type analysis, power source installed capacity analysis, grid connection method analysis, and output characteristics analysis.

[0012] S5: Based on the total load of the region and the power plant output forecast, the net load is obtained by adding them together.

[0013] When analyzing the net load, the total load and the power plant output are used as the basis and the calculation is performed according to the following formula: Net load = gross load - power plant output.

[0014] S6: Perform tight power balance based on the net load in the two modes of “small load and high output” and “large load and low output”.

[0015] Tight balance analysis includes two modes: large load and small output, and small load and large output. The calculation is performed according to the following formula: 500 (750) kV tight balance load = (total load × load factor - 500 (750) kV power plant consumption - ∑220 (330) kV and below power plant installed capacity × output factor) × 90%; 220 (330) kV tight balance load = (total load × load factor - 220 (330) kV large users and 220 (330) kV and above factory power - ∑110 kV and below power plant installed capacity × output coefficient) × 90%.

[0016] S7: Carry out grid planning based on the tight power balance situation.

[0017] Power grid planning includes equipment planning and grid planning, which are calculated according to the following formula: 500 (750) kV equipment capacity requirement = 500 (750) kV tight balance load × capacity-load ratio - 500 (750) kV existing transformer capacity; 220 (330) kV equipment capacity requirement = 220 (330) kV tight balance load × capacity-load ratio - 220 (330) kV existing transformer capacity.

[0018] S8: Based on the grid-side energy storage, power supply-side energy storage and user-side energy storage, verify the load-storage resource requirements under tight balance conditions.

[0019] When analyzing the load storage resource allocation, the calculation is performed according to the following formula: 500 (750) kV energy storage demand = (total load × load factor - 500 (750) kV plant power - ∑220 (330) kV and below power plant installed capacity × output factor) × 10% - 220 (330) kV and below energy storage facility charging and discharging power; Energy storage charging and discharging power = energy storage installed capacity × energy storage charging efficiency.

[0020] S9: According to the grid capacity margin and the transmission channel conditions, select the extreme situations faced by the grid operation and conduct a "two-pole" verification of the safety margin.

[0021] In the safety margin verification analysis, calculation is performed according to the following formula: 500 (750) kV capacity-to-load ratio calculation = (500 (750) kV current transformer capacity + 500 (750) kV planned transformer capacity) ÷ 500 (750) kV extreme load; 500 (750) kV extreme load = total load × load factor - 500 (750) kV plant power - ∑ 220 (330) kV and below conventional power plant installed capacity × output factor; Calculation of 220 (330) kV capacity-to-load ratio = (220 (330) kV existing transformer capacity + 220 (330) kV planned transformer capacity) ÷ 220 (330) kV extreme load; 220 (330) kV extreme load = total load × load factor - 220 (330) kV large users and 220 (330) kV and above factory power - ∑110 kV and below conventional power plant installed capacity × output factor; Power delivered in extreme cases = ∑500 (750) kV and below power plant installed capacity × output coefficient; Transmission capacity requirement = ∑ transmission channel line maximum transmission capacity × 80% - power transmission under extreme conditions; 500 (750) kV capacity margin check: If the capacity-load ratio is 1.5~1.8, the safety margin requirement is met; 220 (330) kV capacity margin check: if the capacity-load ratio is 1.6~1.9, it meets the safety margin requirement; If the external delivery channel verification shows that the external delivery capacity demand is greater than 0, the safety margin requirement is met. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the process of the present invention; Implementation

[0023] like Figure 1 As shown, the present invention provides a planning method based on integrated coordination of source, grid, load and storage.

[0024] The present invention comprises the following steps: S1: Forecast conventional load based on the historical annual load situation in the region.

[0025] When conducting conventional load forecasting, methods such as natural growth + large user method, maximum load utilization hours method, and time series method can be used for forecasting.

[0026] S2: Forecast new loads based on the development of new loads in the region.

[0027] When forecasting new types of loads, it includes forecasts for electric vehicle charging, 5G base stations, and “coal to electricity”.

[0028] S3: Forecast the total load based on the conventional load and new load conditions in the region.

[0029] When predicting the total load, the total load can be calculated according to formula 1): 1) Total load = new load + conventional load.

[0030] S4: Forecast power plant output based on regional power supply conditions.

[0031] Power plant output forecasting includes power source type analysis, power source installed capacity analysis, grid connection method analysis, and output characteristics analysis.

[0032] S5: Based on the total load of the region and the power plant output forecast, the net load is obtained by adding them together.

[0033] When analyzing the net load, the total load and the power plant output are used as the basis, and the calculation can be performed according to formula 2): 2) Net load = total load - power plant output.

[0034] S6: Perform tight power balancing based on the net load in the two modes of “small load and high output” and “large load and low output”.

[0035] Tight balance analysis includes two modes: large load and small output, and small load and large output. Calculation is performed according to formulas 3) to 4): 3) 500 (750) kV tight balance load = (total load × load factor - 500 (750) kV power plant consumption - ∑220 (330) kV and below power plant installed capacity × output factor) × 90%; 4) 220 (330) kV tight balance load = (total load × load factor - 220 (330) kV large users and 220 (330) kV and above factory power - ∑110 kV and below power plant installed capacity × output coefficient) × 90%.

[0036] S7: Carry out grid planning based on the tight power balance situation.

[0037] Power grid planning includes equipment planning and grid planning. Equipment capacity requirements can be calculated according to formulas 5) to 6): 5) 500 (750) kV equipment capacity requirement = 500 (750) kV tight balance load × capacity-load ratio - 500 (750) kV existing transformer capacity; 6) 220 (330) kV equipment capacity requirement = 220 (330) kV tight balance load × capacity-load ratio - 220 (330) kV existing transformer capacity.

[0038] S8: Based on the grid-side energy storage, power supply-side energy storage and user-side energy storage, verify the load-storage resource requirements under tight balance conditions.

[0039] When analyzing the allocation of load and storage resources, the 500 (750) kV energy storage demand and charging and discharging power can be calculated according to formulas 7) to 8): 7) 500 (750) kV energy storage demand = (total load × load factor - 500 (750) kV plant power - ∑220 (330) kV and below power plant installed capacity × output factor) × 10% - 220 (330) kV and below energy storage facility charging and discharging power; 8) Energy storage charging and discharging power = energy storage installed capacity × energy storage charging efficiency.

[0040] S9: According to the grid capacity margin and the transmission channel conditions, select the extreme situations faced by the grid operation and conduct a "two-pole" verification of the safety margin.

[0041] In the safety margin verification analysis, the capacity-load ratio, extreme load, power transmission in extreme situations, transmission demand, capacity margin verification and transmission channel verification can be calculated according to formulas 9) to 17): 9) 500 (750) kV capacity-to-load ratio calculation = (500 (750) kV existing transformer capacity + 500 (750) kV planned transformer capacity) ÷ 500 (750) kV extreme load; 10) 500 (750) kV extreme load = total load × load factor - 500 (750) kV plant power consumption - ∑ 220 (330) kV and below conventional power plant installed capacity × output factor; 11) 220 (330) kV capacity-to-load ratio calculation = (220 (330) kV existing transformer capacity + 220 (330) kV planned transformer capacity) ÷ 220 (330) kV extreme load; 12) 220 (330) kV extreme load = total load × load factor - 220 (330) kV large users and 220 (330) kV and above factory power - ∑ 110 kV and below conventional power plant installed capacity × output factor; 13) Power delivered in extreme cases = ∑500 (750) kV and below power plant installed capacity × output coefficient; 14) Transmission capacity requirement = ∑ transmission channel line maximum transmission capacity × 80% - power transmission under extreme conditions; 15) 500 (750) kV capacity margin check: if the capacity-load ratio is 1.5~1.8, it meets the safety margin requirement; 16) 220 (330) kV capacity margin check: if the capacity-load ratio is 1.6~1.9, it meets the safety margin requirement; If the external delivery channel verification shows that the external delivery capacity demand is greater than 0, the safety margin requirement is met.

Claims

1. A planning method based on integrated coordination of source, grid, load and storage. It is characterized in that The following steps are involved: S1: Forecast conventional load based on the historical annual load of the region; S2: Forecast new loads based on the development of new loads in the region; S3: Forecast the total load based on the conventional load and new load conditions in the region; S4: Predict power plant output based on regional power supply conditions; S5: Based on the total load of the region and the power plant output forecast, the net load is obtained by superposition; S6: Perform power tight balancing based on the net load in the two modes of "small load and high output" and "large load and low output"; S7: Carry out power grid planning based on the tight power balance situation; S8: Verify the load-storage resource requirements under tight balance conditions based on the grid-side energy storage, power supply-side energy storage, and user-side energy storage conditions; S9: According to the grid capacity margin and the transmission channel conditions, select the extreme situations faced by the grid operation and conduct a "two-pole" check of the safety margin.

2. A planning method based on source-grid-load-storage integrated collaboration as claimed in claim 1, It is characterized in that The conventional load forecast described in S1 can be calculated using the natural growth + large user method, the maximum load utilization hours method, and the time series method.

3. A planning method based on source-grid-load-storage integrated collaboration as claimed in claim 2, It is characterized in that The new load forecast described in S2 includes electric vehicle charging, 5G base stations, and "coal to electricity" loads.

4. A planning method based on source-grid-load-storage integrated coordination as claimed in claim 3, It is characterized in that The total load described in S3 can be calculated according to formula 1): 1) Total load = new load + conventional load.

5. A planning method based on source-grid-load-storage integrated coordination as claimed in claim 4, It is characterized in that The power plant output described in S4 includes power source type analysis, power source installed capacity analysis, grid connection method analysis, and output characteristics analysis.

6. A planning method based on source-grid-load-storage integrated coordination as claimed in claim 5, It is characterized in that The net load described in S5 is based on the total load and the power plant output and can be calculated according to formula 2): 2) Net load = total load - power plant output.

7. A planning method based on source-grid-load-storage integrated coordination as claimed in claim 6, It is characterized in that The tight balance described in S6 includes two modes: large load and small output, and small load and large output. The calculation is performed according to formulas 3) to 4): 3) 500 (750) kV tight balance load = (total load × load factor - 500 (750) kV power plant consumption - ∑220 (330) kV and below power plant installed capacity × output factor) × 90%; 4) 220 (330) kV tight balance load = (total load × load factor - 220 (330) kV large users and 220 (330) kV and above factory power - ∑110 kV and below power plant installed capacity × output coefficient) × 90%.

8. A planning method based on source-grid-load-storage integrated coordination as claimed in claim 7, It is characterized in that The power grid planning described in S7 includes equipment planning and grid planning. The equipment capacity requirements can be calculated according to formulas 5) to 6): 5) 500 (750) kV equipment capacity requirement = 500 (750) kV tight balance load × capacity-load ratio - 500 (750) kV existing transformer capacity; 6) 220 (330) kV equipment capacity requirement = 220 (330) kV tight balance load × capacity-load ratio - 220 (330) kV existing transformer capacity.

9. A planning method based on source-grid-load-storage integrated coordination as claimed in claim 8, It is characterized in that The load-storage resource configuration described in S8 can be calculated according to formulas 7) to 8): 7) 500 (750) kV energy storage demand = (total load × load factor - 500 (750) kV plant power - ∑220 (330) kV and below power plant installed capacity × output factor) × 10% - 220 (330) kV and below energy storage facility charging and discharging power; 8) Energy storage charging and discharging power = energy storage installed capacity × energy storage charging efficiency.

10. A planning method based on source-grid-load-storage integrated collaboration as claimed in claim 9, It is characterized in that The safety margin check described in S9 can be calculated according to formulas 9) to 17): 9) 500 (750) kV capacity-to-load ratio calculation = (500 (750) kV existing transformer capacity + 500 (750) kV planned transformer capacity) ÷ 500 (750) kV extreme load; 10) 500 (750) kV extreme load = total load × load factor - 500 (750) kV plant power consumption - ∑ 220 (330) kV and below conventional power plant installed capacity × output factor; 11) 220 (330) kV capacity-to-load ratio calculation = (220 (330) kV existing transformer capacity + 220 (330) kV planned transformer capacity) ÷ 220 (330) kV extreme load; 12) 220 (330) kV extreme load = total load × load factor - 220 (330) kV large users and 220 (330) kV and above factory power - ∑ 110 kV and below conventional power plant installed capacity × output factor; 13) Power delivered in extreme cases = ∑500 (750) kV and below power plant installed capacity × output coefficient; 14) Transmission capacity requirement = ∑ transmission channel line maximum transmission capacity × 80% - power transmission under extreme conditions; 15) 500 (750) kV capacity margin check: if the capacity-load ratio is 1.5~1.8, it meets the safety margin requirement; 16) 220 (330) kV capacity margin check: if the capacity-load ratio is 1.6~1.9, it meets the safety margin requirement; 17) Delivery channel verification: If the delivery capacity requirement is greater than 0, the safety margin requirement is met.

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